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AIMB-250 User’s Manual
17
1.6.2 Intel 855GME and ICH4
The Intel 855GME GMCH components provide the processor interface, DDR SDRAM
interface, display interface, and Hub interface. The Intel 855GME also has an option for
AGP external graphics port, in addition to integrated graphics support for added board
flexibility options.
The Intel 855GM GMCH is in a 732-pin Micro-FCBGA package and contains the following
functionality listed below:
• AGTL+ host bus supporting 32-bit host addressing with Enhanced Intel SpeedStep
technology support
• Supports a single channel of DDR SDRAM memory
• System memory supports DDR200/266 MHz (SSTL_2) DDR SDRAM
• Integrated graphics capabilities: Display Core frequency at 133 MHz or 200 MHz
• Render Core frequency at 100 MHz ,133 MHz, and 200 MHz
• Provides supports four display ports: one progressive scan analog monitor, dual
channel LVDS interface and two DVO port.
The Intel EE GMCH is in a 732-pin Micro-FCBGA package and contains all features listed
above and the additional functionality list below:
• Display Core frequency at 133 MHz, 200 MHz, or 250 MHz
• Render Core frequency at 100 MHz ,133 MHz, 166 MHz, 200 MHz, or 250 MHz
• System memory supports 200/266/333- MHz (SSTL_2) DDR SDRAM.
• Enhanced Power Management Graphics features
The GMCH IGD provides a highly integrated graphics accelerator delivering high
performance 2D, 3D, and video capabilities. With its interfaces to UMA using a DVMT
configuration, an analog display, a LVDS port, and two digital display ports (e.g. flat panel),
the GMCH can provide a complete graphics solution.
The GMCH also provides 2D hardware acceleration for block transfers of data (BLTs). The
BLT engine provides the ability to copy a source block of data to a destination and perform
raster operations (e.g., ROP1, ROP2, and ROP3) on the data using a pattern, and/or
another destination. Performing these common tasks in hardware reduces CPU load, and
thus improves performance. High bandwidth access to data is provided through the system
memory interface. The GMCH uses Tiling architecture to increase system memory
efficiency and thus maximize effective rendering bandwidth. The Intel 855GME GMCH
improves 3D performance and quality with 3D Zone rendering technology. The Intel
855GME GMCH also supports Video Mixer rendering and Bi-Cubic filtering.